[DJP2014]

Unfortunately, the software systems are now so secure that aftermarket tuners can't get into that system to add such a thing.

If everyone did their homework like you seemed to have done, perhaps there would be aftermarket tuners that would allow this. Unfortunately, almost nobody digs in as deep as you have. Have you ever tried asking anyone at the dealership a question about the 4-wheel drive systems in any of the Jeeps? They're stunningly clueless every time I've asked over the years.